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Windows 7: Trusted Root Certification Authorities in IE8

A week ago, I installed a fresh Win7 Home Premium on my laptop-A. After all the Windows Updates, I took a look inside the Trusted Root Certification Authorities, I found some entries appear twice. e.g. there are two Thawte Premium Server CA, and few other entries I known not there.

I check my another laptop-B which had been used for 3 months. the certification entries there are correct.

1 week later, I have a look at laptop-A again, some entries changed and there're still two Thawte Premium Server CA.

I wonder what's going on and how to fix it? does the root certification get updated itself automatically?

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Quote:

Root certificates on Windows Vista and later are distributed via the automatic root update mechanism – that is, per root certificate. When a user visits a secure Web site (by using HTTPS SSL), reads a secure email (S/MIME), or downloads an ActiveX control that is signed (code signing) and encounters a new root certificate, the Windows certificate chain verification software checks Microsoft Update for the root certificate. If it finds it, it downloads the current Certificate Trust List (CTL) containing the list of all trusted root certificates in the Program, and verifies that the root certificate is listed there; it then downloads the specified root certificate to the system and installs it in the Windows Trusted Root Certification Authorities Store. If the root certificate is not found, the certificate chain is not completed, and the system returns an error. To the user, a successful root update is seamless. The user does not see any security dialog boxes or warnings. The download happens automatically. In addition, Windows Vista and later client SKUs support weekly pre-fetching from Microsoft Update to check for updated root certificate properties (for example, extended validation (EV), code signing or server authentication properties, which are certificate properties added to a root certificate).

For detailed technical information about how Windows updates root certificates in Windows Vista and later, visit the following Web site:

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